M6.4 earthquake - 20 km WNW of Hihifo, Tonga
9810 d ago · 7 Dec 1999, 21:29 UTC 20 km WNW of Hihifo, Tonga
What happened
A magnitude 6.4 earthquake struck 20 km WNW of Hihifo, Tonga on 7 Dec 1999, 21:29 UTC at a depth of 138 km.
Earthquakes of this size are classed as Strong. Can cause damage in populated areas up to tens of kilometres away. This was an intermediate-depth earthquake, so shaking is spread over a wider, gentler area.
Timeline
First reported by USGS
16 Oct 2026, 20:46 UTC
Community
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